a-ak aaaa aaab aaac aaar aaba aabb aabc aaca aacb aacc aack aacr aacu aaka aaku aara aarc aaru abaa abab abac abag abak abar abau abb- abba abbb abbr abca abcb abcc abcr abra abrc abua abug abuk acaa acab acac acag acar acba acca accc accu acga acgr acr- acra acrc acrr acu- acur agac agag agar agau agba agca agcc agga aggu agra agua agur akaa akar akca akka akku akr- akra akua arab arac arag arak arar arau arba arc- arca arga argb arka arr- arra arrc arrg arrk arrr arru arua arub arug auaa auca auga aur- aura auug baaa baak baar baba babb babr babu bac- baca bacc back baga bagg bak- baka bakr baku bar- bara barb barc barg bark barr baru bau- baug bauk baur bbau bbbb bbga bbrc bbrg bcaa bcar bcbc bcbg bcca bccc bcra bcru bcuc bgca brab brac brag brak brau brca brcb brka brkb brrr bruc brug buar buba bubb bubu buca bucc buck bucu buga bugg buka bukk buku bur- bura burb burg burk burr buru caaa caab caac caba cabg cabu cac- caca cacc cack cacr caga cagg cagr caka cara carb carc cark carr cauc cauk cbac cbar cbbc cbca cbcc cbcr cbcu cbga cbgb cbka cbkg cbkr ccaa ccab ccac ccag ccar ccba ccbc ccca cccb cccc cccu ccga ccgc ccra ccrc ccrg ccuc cgac cgcc cgcg ckac ckbc ckck ckga ckrc crab crac crag crar crau crbc crbu crca crcc crcr crkc crub crug cruk cuau cub- cuba cubb cuca cucc cuck cuga cuk- cuka cura curb curr gaar gaba gabb gabr gabu gack gaga gagg gagu gaku gara garb garg garr gaua gaub gauk gaur gbag gc-c gcaa gcbc gccc gcrg gggg grab grac grau grbr grcc grrr grua grub grug grur guaa guac guag guar guba gubb gubu guca guck guga gugb gugg gugu gura gurb gurg gurk gurr guru kaaa kaab kaag kaak kaar kaba kabb kabc kabg kabr kabu kacb kacc kacu kag- kaga kagb kagc kagg kagr kagu kaka kakc kakk kaku kara karb karg kark karr karu kau- kaub kauc kaug kauk kaur kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbg kbbk kbbr kbbu kbca kbcb kbck kbcr kbcu kbga kbgb kbgg kbgr kbkb kbkg kbkk kbkr kbra kbrb kbrc kbrg kbrk kbru kbua kbub kbuc kbuk kbur kbuu kcaa kcab kcac kcar kcau kcba kcbc kcbk kcbr kcbu kcca kccb kccc kcck kccr kccu kcgc kcgr kckc kckk kckr kcrc kcrg kcrr kcru kcua kcub kcuk kgab kgac kgak kgba kgbb kgbc kgbr kgcb kgcc kgcr kgga kggg kggr kgra kgrb kgrc kgrg kgrk kgrr kgua kkaa kkac kkag kkar kkba kkbb kkbg kkbr kkcb kkck kkcr kkgb kkgr kkkk kkrb kkrc kkrk kkrr kkua kkuu krab krac krag krak krar krba krbb krbg krbk krbr krca krcb krcc krcg krcu krka krkc krkk krkr krku krrb krrc krrg krrk krrr krua kruc krug kruk krur kuac kuar kuau kuba kubb kubc kubr kubu kuca kucb kucc kucr kuga kugb kugr kuka kukk kuku kura kurb kurk kurr kuru kuub kuuk kuur kuuu raab raag raak raba rabb rabk rabu rac- raca racc rack racu raga ragg ragu raka rakk raku rara rarb rark raua raub rauc rauk rbbb rbbr rcac rcbc rccb rccc rcga rcgc rcrg rgba rrrr ruag ruba rubb rubu ruca ruck ruga rugg ruka rukk ruku rura rurc ruru uabc uaca uarc uaru uaua ubac ubar ubba ubra ucak ucar ucbc ucca ucka ucrc ucua ugab ugar ugcc ugcg ugra ugur uguu ukba ukcc ukra ukrc ukur urac urau urba urca urga urgu urka urra uruk urur uuuu